Yokosuka K4Y

The Yokosuka K4Y/ Navy Type 90 Seaplane Trainer was a Japanese floatplane trainer of the 1930s.

A single engine two-seat biplane, 211 K4Ys were built between 1933 and 1940, serving as the Imperial Japanese Navy’s basic floatplane trainer throughout the Second World War.

Yokosuka built two prototypes, powered by 90 hp (67 kW) Hatakaze four-cylinder air-cooled inline engines in 1930, flying in 1930, and after successful testing, a version powered by a 130 hp Gasuden Jimpu radial engine was ordered into production as the Navy Type 90 Seaplane trainer, with the short designation K4Y1.

Specifications

Crew

2

Length

9.05 m (29 ft 8 in)

Wingspan

10.90 m (35 ft 9 in)

Height

3.51 m (11 ft 6 in)

Wing area

29.5 m2 (318 sq ft)

Empty weight

740 kg (1,631 lb)

Gross weight

990 kg (2,183 lb)

Powerplant

1 × Gasuden Jimpu 2 seven-cylinder air-cooled radial engine,

97 kW (130 hp)

Performance

Maximum speed

163 km/h (101 mph, 88 kn) at sea level

Cruise speed

93 km/h (58 mph, 50 kn)

Range

310 km (200 mi, 170 nmi)

Endurance

3 hours 30 min

Service ceiling

3,460 m (11,350 ft)

Time to altitude

29 min 20 sec to 3,000 m (9,800 ft).